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2. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

3. Otto cycle - Wikipedia

   en.wikipedia.org/wiki/Otto_cycle

   The first person to build a working four-stroke engine, a stationary engine using a coal gas-air mixture for fuel (a gas engine), was German engineer Nicolaus Otto. [4] This is why the four-stroke principle today is commonly known as the Otto cycle and four-stroke engines using spark plugs often are called Otto engines.

4. Two- and four-stroke engines - Wikipedia

   en.wikipedia.org/wiki/Two-_and_four-stroke_engines

   Opposed-piston engines have been tried before in both 2 stroke and 4 stroke, the combination of the two different cycles is unique to this engine. The engine has a far greater efficiency over the break-even value known to combustion engines (about 35%) and closer to the one associated with steam turbines or electric engines (about 70%).

5. Four-stroking - Wikipedia

   en.wikipedia.org/wiki/Four-stroking

   Four-stroking is a condition of two-stroke engines where combustion occurs every four strokes or more, rather than every two. Though normal in some instances at idle, extremely high engine speeds, and when letting off the throttle, such firing is uneven, noisy and may, in cases of malfunction, damage the engine if allowed to continue unabated.

6. Desaxe - Wikipedia

   en.wikipedia.org/wiki/Desaxe

   In a conventional four-stroke engine, each of the strokes (intake, compression, power, exhaust) involves a nominal rotation of 180°, totaling 720° for the complete 4-stroke combustion cycle. A desaxe engine adds to the duration of the two downward strokes (intake and power), and subtracts the same amount from the two upward strokes ...

7. More Bang for Your Buck: Eleven Best Motorcycles on the ... - AOL

   www.aol.com/finance/more-bang-buck-eleven-best...

   Engine: Single-cylinder, 4-stroke. Features: Improved chassis and suspension for cornering and handling, Connectivity Unit Offroad module boosting off-road performance, ...